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INDIANAPOLIS — A 77-year-old woman suffered a fatal stab wound while trying to break up a sword fight Thursday between her grandson and brother-in-law, police said.

An autopsy determined Franziska Stegbauer died of a wound from one of the swords, police Sgt. Matthew Mount said. Both men were hospitalized with stab wounds and one was critically hurt.

"We're unsure yet who started this fight, how the swordplay got involved," Mount said. "We're not sure who it was who stabbed the woman. We'll have to do some testing on the swords and figure out who had which sword, whose blood is on which sword."

One of the weapons was a World War II-era Japanese officer's sword with a thin blade, and the other had a thicker blade, Mount said.